SFO’s Red and Blue AirTrain loops serve different destinations and directions. Terminal 3 uses the shared Terminals 2 & 3 station while its dedicated station is closed.
Where to start
Choose the loop by your destination, and check the current maintenance notice. A full-loop time isn't the time to your own stop.
What this guide covers
This guide focuses on the routes below, using research dated 2026-10-31. It can’t confirm every airline, gate, entry rule, accessible path or service change at San Francisco Airport on your travel day.
Routes and pickup points
Start with the direction and access area that match your trip. A public shuttle, a secure-side bus and a city coach may all appear on one airport map, but they take you to different places.
Terminals / Garage G / Grand Hyatt → Other Red Line stop
| Service and access | automated people mover; public area, after entry where required |
|---|---|
| Direction | Network description only; no individual terminal pair or shortest path is inferred. |
| Boarding point | Not specified in the selected source. |
| Alighting point | Not specified in the selected source. |
| Fare status | described as free for this segment |
| Published local hours | Listed as 24 hours; maintenance may change 23:00–05:00 service. |
Eligibility and checks
- Confirm the current service and your eligibility with the operator.
Source cautions
- The Red Line circles clockwise; its roughly nine-minute full loop isn't the time to a specific stop.
- Use the shared Terminals 2 & 3 station while the dedicated T3 station is closed.
Source notes reviewed 2026-10-31: SFO1 ↗. A published interval or ride time isn't a minimum connection time.
Terminals → Rental Car Center / Long-Term Parking / other Blue stops
| Service and access | automated people mover; public area, after entry where required |
|---|---|
| Direction | Network description only; no individual terminal pair or shortest path is inferred. |
| Boarding point | Not specified in the selected source. |
| Alighting point | Not specified in the selected source. |
| Fare status | described as free for this segment |
| Published local hours | Listed as 24 hours; check maintenance notices. |
Eligibility and checks
- Confirm the current service and your eligibility with the operator.
Source cautions
- The Blue Line circles counterclockwise. Its roughly 25-minute full loop isn't a trip time to every destination.
Source notes reviewed 2026-10-31: SFO1 ↗. A published interval or ride time isn't a minimum connection time.
T1 passenger building → AirTrain station
| Service and access | signed walking route; public area, after entry where required |
|---|---|
| Direction | Only the described direction is supported by this record. The reverse stop isn't inferred. |
| Boarding point | AirTrain access via the skybridge; terminal T1; level Level 3 mezzanine |
| Alighting point | Not specified in the selected source. |
| Fare status | faren't established |
Eligibility and checks
- Confirm the current service and your eligibility with the operator.
Still unconfirmed: exact platform for each direction.
Source notes reviewed 2026-10-31: SFO1 ↗. A published interval or ride time isn't a minimum connection time.
Changes and service warnings
Check the effective date and the current operator notice before following a saved route.
Dedicated T3 AirTrain station closed
The dedicated Terminal 3 station is marked closed until a planned new station in 2027. Use the shared Terminals 2 & 3 station; no exact reopening date was confirmed.
What remains to confirm
Before you use one of these routes, check the operating carrier, flight date and current stop with the airport or transport provider. These records can’t tell you whether your bag is checked through, whether you may enter the country, how long the queues are or whether you have enough time to connect.
Official sources and date
Source material was reviewed on 2026-10-31. Airport operations and individual flights can change after that date.